. Notes on the North American ganoids [microform] : Amia, Lepidosteus, Acipenser, and Polyodon, with three plates. Ganoidei; Fishes; Ganoide; Poissons. flrst dorsal nnd are |) .a^ -mmr â¢rr ⢠-».^-^ ,â *>â â B. NATURAL HISTOnT. 16A have their more or less accurate counterparts among various living and fossil Ganoids and Simrks.'^ Alo})iiiii has a long upper lobe (so-called).'* In Pohjndnn and some species oi and In most Sharks, the upper lobe is but little the longer; in iMtnna the lower lobe nearly ei|ual8 the upper. I am not acquainted with any Ganoid or Selachian where tiin
. Notes on the North American ganoids [microform] : Amia, Lepidosteus, Acipenser, and Polyodon, with three plates. Ganoidei; Fishes; Ganoide; Poissons. flrst dorsal nnd are |) .a^ -mmr â¢rr ⢠-».^-^ ,â *>â â B. NATURAL HISTOnT. 16A have their more or less accurate counterparts among various living and fossil Ganoids and Simrks.'^ Alo})iiiii has a long upper lobe (so-called).'* In Pohjndnn and some species oi and In most Sharks, the upper lobe is but little the longer; in iMtnna the lower lobe nearly ei|ual8 the upper. I am not acquainted with any Ganoid or Selachian where tiin lower lobe is the longer, as in the sixth stage of LcpiiloHleus (Fig. 5).'* The last stage (7, fig. G), exists in Amla olone among living Ganoids, and, so far as I am aware, is not presented by any palae- ozoic forma; their tails being either protocercal (as in Olyptolce- ) or obviously heterocercal as in Pulceoniscus, etc. But among mcsozoic forms the amioid tail is not unusual; and a series may easily be formed, as, for instance, of Lepirlotua, Meg- alnrun and Thviiianpa by which the truly heterocercal tail is appar- ently converted into the apparently homocercal form. Indeed the tail of Mpgalurua, as figured by Agassiz (5, tab. K, fig. 4), might almost be tauen for that of Amia.^'^ " Several (<i)e. 336), thinks " thoro is no positive roaaou for arranging the Mcga'.uri (whiuh he regards at Teleo^toi) with the ;. 1 W-:. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wilder, Burt G. (Burt Green), 1841-1925. [Salem, Mass. ? : s. n. ]
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectfishes, bookyear1876
